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a viral insult, usually calling someone a douche bag, or tool. (commonly used with the suffixes -neck ass, -boot ass, and -face ass, etc.
Boy.!! im bout to cook yo mononucleosis head ass.!!! BOY.!!!
by The REAL Ceasar's Palace December 07, 2010
disease that can be passed on. also called the kissing disease. basicaly, kiss someone with this and you're so f*ckin screwed.
dude1:you kissed her?!
BF: so what?
dude3:she has that mononucleosis thingy
dude2:you are so screwed.
by Diamond Ice May 18, 2006